Residential Roof Terminology

Ice dams occur when melted snow refreezes near the overhang of a roof blocking the path for water run off and building up a heavy wall of ice.

Residential roof terminology.

A line made on the roof by snapping a taut string or cord dusted with chalk. Occurs where overlapping materials are seamed sealed or. Roofing terms you should know deck sheathing. An l shaped strip usually metal installed along roof.

That part of a roofing waterproofing or flashing component that overlaps or covers any portion of the same or. The highest fire resistance rating for roofing as per astm e 108 or ulc s107. What is an ice dam. An area of a roof with a valley on one side and a rake on the other and both come together at a point.

A roof s slope is the number of inches it rises for every 12 inches of horizontal run a roof with a 4 in 12 slope rises 4 inches for every 12 inches of horizontal run. A small structure projecting from a sloped roof usually with a window. An asphalt based roof cement formulated to adhere overlapping plies or asphalt roll roofing. A hip roof is a roof in which four separate roof planes all come together at the top.

It is the number of inches a roof rises vertically for every 12 inches of travel horizontally. A roof is typically referred to for example as a 4 12 or 4 pitch. Used for alignment purposes. Pitch this is the slope of the roof.

The same roof has a 4 12 or 1 3 pitch. The surface usually plywood or oriented strand board osb to which roofing materials are applied. The terms pitch and slope are simply two different ways of expressing the same measurement.